From fe085f13c7901203445fd2ab26c0f499313b8258 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 21 Mar 2017 10:25:52 +0000 Subject: [PATCH] drm/i915: Remove intel_ring.last_retired_head Storing the position of the breadcrumb of the last retired request as a separate last_retired_head is superfluous as we always copy that into head prior to recalculation of the intel_ring.space. Signed-off-by: Chris Wilson Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/20170321102552.24357-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_debugfs.c | 5 ++--- drivers/gpu/drm/i915/i915_gem_request.c | 2 +- drivers/gpu/drm/i915/intel_lrc.c | 2 -- drivers/gpu/drm/i915/intel_ringbuffer.c | 21 ++++---------------- drivers/gpu/drm/i915/intel_ringbuffer.h | 10 ---------- drivers/gpu/drm/i915/selftests/mock_engine.c | 1 - 6 files changed, 7 insertions(+), 34 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 47e707d83c4d..29bf11d8b620 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -1938,9 +1938,8 @@ static int i915_gem_framebuffer_info(struct seq_file *m, void *data) static void describe_ctx_ring(struct seq_file *m, struct intel_ring *ring) { - seq_printf(m, " (ringbuffer, space: %d, head: %u, tail: %u, last head: %d)", - ring->space, ring->head, ring->tail, - ring->last_retired_head); + seq_printf(m, " (ringbuffer, space: %d, head: %u, tail: %u)", + ring->space, ring->head, ring->tail); } static int i915_context_status(struct seq_file *m, void *unused) diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c index 0e8d1010cecb..dbfa9db2419d 100644 --- a/drivers/gpu/drm/i915/i915_gem_request.c +++ b/drivers/gpu/drm/i915/i915_gem_request.c @@ -295,7 +295,7 @@ static void i915_gem_request_retire(struct drm_i915_gem_request *request) * completion order. */ list_del(&request->ring_link); - request->ring->last_retired_head = request->postfix; + request->ring->head = request->postfix; if (!--request->i915->gt.active_requests) { GEM_BUG_ON(!request->i915->gt.awake); mod_delayed_work(request->i915->wq, diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index a88380876ce9..090238eefd49 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -1260,7 +1260,6 @@ static void reset_common_ring(struct intel_engine_cs *engine, ce->lrc_reg_state[CTX_RING_HEAD+1] = request->postfix; request->ring->head = request->postfix; - request->ring->last_retired_head = -1; intel_ring_update_space(request->ring); /* Catch up with any missed context-switch interrupts */ @@ -2047,7 +2046,6 @@ void intel_lr_context_resume(struct drm_i915_private *dev_priv) i915_gem_object_unpin_map(ce->state->obj); ce->ring->head = ce->ring->tail = 0; - ce->ring->last_retired_head = -1; intel_ring_update_space(ce->ring); } } diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index d9b8d17c3fc6..0ca5ea7a9407 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -49,13 +49,7 @@ static int __intel_ring_space(int head, int tail, int size) void intel_ring_update_space(struct intel_ring *ring) { - if (ring->last_retired_head != -1) { - ring->head = ring->last_retired_head; - ring->last_retired_head = -1; - } - - ring->space = __intel_ring_space(ring->head & HEAD_ADDR, - ring->tail, ring->size); + ring->space = __intel_ring_space(ring->head, ring->tail, ring->size); } static int @@ -618,12 +612,8 @@ static void reset_ring_common(struct intel_engine_cs *engine, } /* If the rq hung, jump to its breadcrumb and skip the batch */ - if (request->fence.error == -EIO) { - struct intel_ring *ring = request->ring; - - ring->head = request->postfix; - ring->last_retired_head = -1; - } + if (request->fence.error == -EIO) + request->ring->head = request->postfix; } else { engine->legacy_active_context = NULL; } @@ -1392,7 +1382,6 @@ intel_engine_create_ring(struct intel_engine_cs *engine, int size) if (IS_I830(engine->i915) || IS_I845G(engine->i915)) ring->effective_size -= 2 * CACHELINE_BYTES; - ring->last_retired_head = -1; intel_ring_update_space(ring); vma = intel_ring_create_vma(engine->i915, size); @@ -1571,10 +1560,8 @@ void intel_legacy_submission_resume(struct drm_i915_private *dev_priv) struct intel_engine_cs *engine; enum intel_engine_id id; - for_each_engine(engine, dev_priv, id) { + for_each_engine(engine, dev_priv, id) engine->buffer->head = engine->buffer->tail; - engine->buffer->last_retired_head = -1; - } } static int ring_request_alloc(struct drm_i915_gem_request *request) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index 847aea554464..2ecb41788fb6 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -149,16 +149,6 @@ struct intel_ring { int space; int size; int effective_size; - - /** We track the position of the requests in the ring buffer, and - * when each is retired we increment last_retired_head as the GPU - * must have finished processing the request and so we know we - * can advance the ringbuffer up to that position. - * - * last_retired_head is set to -1 after the value is consumed so - * we can detect new retirements. - */ - u32 last_retired_head; }; struct i915_gem_context; diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c b/drivers/gpu/drm/i915/selftests/mock_engine.c index 8d5ba037064c..0ad624a1db90 100644 --- a/drivers/gpu/drm/i915/selftests/mock_engine.c +++ b/drivers/gpu/drm/i915/selftests/mock_engine.c @@ -118,7 +118,6 @@ static struct intel_ring *mock_ring(struct intel_engine_cs *engine) ring->vaddr = (void *)(ring + 1); INIT_LIST_HEAD(&ring->request_list); - ring->last_retired_head = -1; intel_ring_update_space(ring); return ring; -- 2.20.1